A fin comb, also known as a coil fin tool, is a specialty tool used to straighten the bent fins of a condensing unit for an air conditioning or heat pump system. You will find the aluminum coil fins on central air conditioning system condensing units or window air conditioner condensing units. The aluminum fins are made of delicate thin gauge metal and can get damaged by tree limbs or sticks, hail, high-pressure power washing, and other factors.
Using a Fin Comb to Straighten Coil Fins
Bent coil fins restrict air flow through the condensing unit and can cause problems such as making the unit run harder, decreasing the unit's efficiency, increase usage of electricity and in severe cases, may lead to early failure of the unit. These bent fins may cause a short cycling compressor, one that turns on and off frequently. Other causes besides bent coils, however, may include an obstructed thermostat, leaking refrigerant, iced coils or in some cases or an oversized cooling system.
Fin comb tools may come with single, multiple or interchangeable heads that have different fin comb sizes and counts to best match the coil fin size of the repaired unit. Some six-sided head models will work for 8, 9, 10, 12, 14 and 15 fins per inch coils. The comb is carefully drawn across the bent coil fins straightening them out in the process.